Sharing a canon printer

I have a wireless network at home with my MBP and my girlfriends windows machine. She has a canon printer hooked up to her windows machine via USB. i cant seem to locate her computer and printer when i try to set up the printer on my MBP....what is the best way so that i can use her printer?
thanks
brent

its an older one...its a canon s520...its really strange...when i first got this MBP back in march...i had it working...then for some reason it stopped working....anyways...i installed bonjour for windows on her machine...how do i get that to work?

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